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sorry i think i put this in the wrong area

yes i thought it was the control valve for the drip line, tried new 2 new selonoids, tried cleaning diaphram, finally replaced valve altogether, still doing it , it seems to be the filter , took it apart cleaned the filter,flushed it out but it still squeals. when i tap it it stops for a couple of seconds.but it is constant when ever the zone is running.is there anything else i can do or do i have to replace this now, thanks for your help

I haven't heard of a controller doing that for a particular zone, you can try moving that zone wire to a different port and see if it does it..
I've heard transformers making lots of noises when they are going out, but that's with everything not just one zone.

controller for drip line squealing

hello, i have a loud squeal when the controller for my drip lines comes on , someone recomended replacing the solenoid , tried two still did the same thing, it is a 10 yr old rainbird do not know the model , is there anything i could try or do you think i should replace the whole unit.